Four cavity building block



FIG. 1 is a perspective view of a four cavity building block showing ournew design.

FIG. 2 is an end elevational view thereof, the other end being a mirrorimage thereof.

FIG. 3 is a top plan view thereof.

FIG. 4 is a side elevational view thereof, the other side being a mirrorimage thereof.

FIG. 5 is a bottom plan view thereof.

The ornamental design for a four cavity building block, as shown anddescribed.